What can we say about these rumors?
Sound and...
The "PROBLEM" with the bass that so many people seem to have. (I'm not blaming anyone, sound is subjective, I slightly blame some companies)
I see many criticisms on Skroutz here about it not having enough bass, I attribute this to some companies that make headphones with excessively boosted bass and generally the entire low end. Often, some companies do this to impress, but it just covers the whole song you're listening to and the higher frequencies, the high end, sounds distant and muddy (like a singer or a guitar), no relation to these headphones. They remind me more of regular studio headphones than everyday headphones (of course, they're not as good as an open-back studio monitor headphone like AKG or something similar), the sound is more flat compared to others, and more pleasant to my ears, just as it should be. Everything is relatively uniform, the bass is exactly as it should be, as much as they put in the song, the vocals sound clear, and it covers all the frequencies satisfactorily without much distortion (maybe the mid sometimes takes the bass by the throat, but rarely). If you really like a lot of bass, get something else, as far as I know, the Sony 710 has plenty of bass at a similar price.
Noise cancellation
It's not as good as some Sony ones I've tried, but it does its job. You hear about 20% of the sounds around you without being annoying, no low tones, as if it takes the sound from outside and cancels all the low tones in the sound, leaving about 20%.
Build quality
They are plastic, if you drop them from 3 meters, they will break. They won't withstand heavy abuse, but with care, they will definitely last for years. However, they still have a sense of authentic premium quality, they feel very well-made, and their design is smart and beautiful in my opinion. I WOULD LIKE A TYPE C USB, but okay, we can overlook that, it's not a big issue.
In summary, balanced sound with very good quality and clarity, thanks to the balance. So, if you like the above-mentioned bass, get something else. Not USB C, but we can overlook that because they are great headphones.
I hope I helped